package day07;

public class PersonTest {
    public static void main(String[] args) {
        // 创建对象
        Person p1 = new Person();
        p1.show(); // name:null age:0
        Person p2 = new Person("Tom", 20);
        p2.show();
        Person p3 = new Person("Jerry");
        p3.show();
        Person p4 = new Person(30);
        p4.show();
      }
    }
